WO2021082213A1

WO2021082213A1 - Liquid crystal display panel and liquid crystal display device

Info

Publication number: WO2021082213A1
Application number: PCT/CN2019/125577
Authority: WO
Inventors: 曹武
Original assignee: 深圳市华星光电半导体显示技术有限公司
Priority date: 2019-10-29
Filing date: 2019-12-16
Publication date: 2021-05-06
Also published as: CN110806653A; US20210333672A1

Abstract

A liquid crystal display panel comprising a first substrate (310) having scan lines and data lines (313) which intersect and define a plurality of pixel units, each pixel unit comprising a common electrode (311), a pixel electrode (315) and a black matrix replacement electrode (316), the black matrix replacement electrode (316) being disposed above the data lines (313) and being insulated from the data lines (313); a second substrate (320) mounted in a pair with the first substrate (310), wherein a black matrix (323) is disposed on the second substrate (320); and a liquid crystal layer (330) disposed between the first substrate (310) and the second substrate (320).

Description

Liquid crystal display panel and liquid crystal display device

This application claims the priority of a Chinese patent application filed with the Chinese Patent Office, the application number is 201911036170.4, and the invention title is "liquid crystal display panel and liquid crystal display device" on October 29, 2019, the entire content of which is incorporated into this application by reference .

Technical field

The invention relates to the technical field of display panels, in particular to a liquid crystal display panel and a liquid crystal display device.

Background technique

Liquid Crystal Display (LCD) has been widely used in mobile phones, TVs, personal digital assistants, digital cameras, notebook computers, etc. because of its high image quality, power saving, thin body and wide application range. Consumer electronics have become the mainstream of display devices.

In the early NonCOA (color filter film layer is provided on the color filter substrate) technology, please refer to FIG. 1, which includes a lower substrate 110 and an upper substrate 120. The lower substrate 110 is sequentially provided with a common electrode 111 and a second substrate from bottom to top. An insulating layer 112, a data line 113, a second insulating layer 114 and a pixel electrode 115. The upper substrate 120 is provided with a first sub-pixel 122, a second sub-pixel 123 and a black matrix 121. In order to prevent the color shift, the data line 113 that distinguishes each sub-pixel needs a shading band, that is, a wide black matrix 121 is needed for isolation, which causes unfriendly aperture or transmittance; at the same time, when the upper and lower substrates are paired together, for the cover part Considering the accuracy of group Shift, BM needs to be further increased.

In order to save the aperture ratio, the VA-type LCD technology has developed a COA (color filter film layer arranged on the array substrate) architecture, and in order to remove the black matrix, the DBS electrode (Data Line BM Less) is used for shielding and shading. For details, please refer to FIG. 2, which includes a lower substrate 210 and an upper substrate 220. The lower substrate 210 is sequentially provided with a common electrode 211, a first insulating layer 212, a data line 213, a second insulating layer 214, and a first sub-substrate from bottom to top. The pixel 215, the second sub-pixel 216, the third insulating layer 217, the pixel electrode 218, and the DBS electrode 219. Since the DBS electrode and the com electrode of the upper substrate are of equal potential input, the voltage difference is small at this place, and the VA liquid crystal does not fall down, so it is kept normally dark to realize shading. However, in this design, there are low-efficiency liquid crystal regions, which is not conducive to the improvement of contrast.

technical problem

In the existing NonCOA architecture, a wider black matrix is required for isolation to prevent color mixing, resulting in unfriendly aperture ratio or transmittance; in another COA architecture, a DBS electrode is set to replace the black matrix to achieve shading, but in this architecture In the middle, there are still low-efficiency liquid crystal regions, which is not conducive to the improvement of contrast.

Technical solutions

In order to solve the above-mentioned problems, the technical solution provided by the present invention is as follows:

The present invention provides a liquid crystal display panel, including:

The first substrate is provided with a plurality of scan lines and a plurality of data lines crossing each other to define a plurality of pixel units, each of the plurality of pixel units includes a common electrode, a pixel electrode and a black matrix replacement electrode, so The black matrix replacement electrode is arranged above the data line to shield it, and is insulated from the data line;

The second substrate is arranged in a pair with the first substrate, wherein the black matrix is arranged on the second substrate and corresponds to the area between any two adjacent pixel units in the plurality of pixel units;

And, the liquid crystal layer is disposed between the first substrate and the second substrate.

In the liquid crystal display panel provided by the embodiment of the present application, the liquid crystal display panel further includes a color resist layer disposed on the first substrate.

In the liquid crystal display panel provided by the embodiment of the present application, the liquid crystal display panel further includes a color resist layer disposed on the second substrate.

In the liquid crystal display panel provided by the embodiment of the present application, the vertical extension lines of the edges on both sides of the black matrix are respectively located inside the outer edges of the common electrodes on both sides of the data line below it.

In the liquid crystal display panel provided by the embodiment of the present application, the distances between the vertical extension lines of the two sides of the black matrix and the outer edges of the common electrodes on both sides of the data line below it are greater than 1 micron.

In the liquid crystal display panel provided by the embodiment of the present application, the vertical extension lines of the edges on both sides of the black matrix are respectively located outside the inner edges of the common electrodes on both sides of the data line below it.

In the liquid crystal display panel provided by the embodiment of the present application, the black matrix replacement electrode and the pixel electrode are formed by the same film forming process and yellow light etching patterning process.

In the liquid crystal display panel provided by the embodiment of the present application, the black matrix replacement electrode and the pixel electrode are spaced apart.

In the liquid crystal display panel provided by the embodiment of the present application, the material of the black matrix replacement electrode is indium tin oxide.

In the liquid crystal display panel provided by the embodiment of the present application, the color resist layer includes a plurality of red color resists, a plurality of blue color resists, and a plurality of green color resists.

In the liquid crystal display panel provided by the embodiment of the present application, the color resist layer is disposed between the data line layer and the pixel electrode layer, and is insulated from the data line and the pixel electrode, respectively.

The present invention also provides a liquid crystal display device, including the aforementioned liquid crystal display panel.

Beneficial effect

The beneficial effects of the present invention are: the present invention provides a liquid crystal display panel, which uses a black matrix to replace the composite light-shielding structure of the electrodes and the black matrix at the data line routing. On the one hand, the black matrix replacement electrode is used for electrical control to achieve light leakage shielding, and the black matrix is used to block the liquid crystal inefficient area caused by the black matrix replacement electrode, effectively controlling the dark field brightness, thereby improving the contrast; on the other hand, replacing the black matrix Under the action of the electrodes, the width of the black matrix can be controlled within a range smaller than the distance between the common electrodes on both sides of the corresponding data line, thereby effectively ensuring the aperture ratio of the pixel. That is, the liquid crystal display panel provided by the present invention can take into account the effective aperture ratio and the color mixing and light leakage control function, and significantly improve the contrast.

Description of the drawings

In order to explain the embodiments or the technical solutions in the prior art more clearly, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are merely inventions. For some embodiments, those of ordinary skill in the art can obtain other drawings based on these drawings without creative work.

FIG. 1 is a schematic structural diagram of a liquid crystal display panel provided in the prior art of the present invention;

2 is a schematic structural diagram of another liquid crystal display panel provided in the prior art of the present invention;

3 is a schematic structural diagram of a liquid crystal display panel provided by an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of another liquid crystal display panel provided by an embodiment of the present invention.

Embodiments of the present invention

The description of the following embodiments refers to the attached drawings to illustrate specific embodiments in which the present invention can be implemented. The directional terms mentioned in the present invention, such as [Up], [Down], [Front], [Back], [Left], [Right], [Inner], [Outer], [Side], etc., are for reference only The direction of the additional schema. Therefore, the directional terms used are used to describe and understand the present invention, rather than to limit the present invention. In the figure, units with similar structures are indicated by the same reference numerals.

The embodiment of the present invention provides a liquid crystal display panel. For details, please refer to FIG. 3, which will be described in detail below. The liquid crystal display panel includes:

The first substrate 310 is provided with a plurality of scan lines (not shown in the figure) for inputting driving signals, and a plurality of data lines 313 for inputting signals to the pixel electrode 315, the plurality of scan lines and the plurality of The data lines 313 are arranged crosswise and define a plurality of pixel units. The pixel units include a common electrode 311, a pixel electrode 315, and a black matrix replacement electrode 316. The black matrix replacement electrode 316 is arranged above the data line 313 to It is shielded and insulated from the data line 313,

Specifically, the first substrate 310 includes a common electrode 311, a first insulating layer 312, a data line 313, a second insulating layer 314, a pixel electrode 315, and a black matrix replacement electrode 316 in order from bottom to top;

The second substrate 320 is provided with a color resist layer and a black matrix 323. The color resist layer includes a plurality of color resists located in the pixel area. The first color resist 321 and the second color resist 322 are exemplarily shown in FIG. The black matrix 323 is formed at the boundary between the first color resistor 321 and the second color resistor 322;

And, the liquid crystal layer 330 is disposed between the first substrate 310 and the second substrate 320, and the direction of the liquid crystal molecules in the liquid crystal layer 330 is controlled by energization or not, so as to refract the light from the backlight module to produce a picture.

Here, a hybrid structure of black matrix 323 + black matrix replacement electrode 316 is adopted, in which the black matrix 323 plays a physical shielding role, and the black matrix replacement electrode 316 plays a role of electrical control and shielding light leakage; therefore, the pairing accuracy can be improved, and the data line 313 is allowed in disguise. The width of the black matrix 323 is reduced. In addition, since the black matrix 323 covers the liquid crystal inefficient area near the black matrix replacement electrode 316, the contrast is further improved on the basis of the existing architecture;

Wherein, the black matrix replacement electrode of the present invention is DBS (Data The line BM less) electrode has the same potential as the common electrode on the second substrate, so that the liquid crystal molecules in this area remain in an undeflected state, which acts as a light shield and can replace the black matrix corresponding to the data line.

In this embodiment, the vertical extension lines on both sides of the black matrix 323 are respectively located inside the outer edges of the common electrode 311 on both sides of the data line 313 underneath. The width design can effectively cover the liquid crystal display. The effective area is used to improve the contrast, and avoid entering the pixel opening area when it is too wide to affect the aperture ratio.

Further, the distances between the vertical extension lines on both sides of the black matrix 323 from the outer edges of the common electrodes 311 on both sides of the data line 313 underneath are D1 and D2, and both D1 and D2 are greater than 1 micron. , In order to prevent Overlay from causing a drop in aperture ratio and transmittance due to group shifting.

In this embodiment, the vertical extension lines of the edges on both sides of the black matrix 323 are respectively located outside the inner edges of the common electrodes 311 on both sides of the data line 313 below it to ensure sufficient shielding of the low-efficiency area of the liquid crystal.

In this embodiment, the black matrix replacement electrode 316 and the pixel electrode 315 are formed by the same film-forming process and yellow photo-etching patterning process. Specifically, a physical vapor deposition process is used on the second insulating layer 314 A layer of indium tin oxide film is deposited, and then a corresponding pattern is formed through a yellow light etching process, that is, the black matrix replacement electrode 316 and the pixel electrode 315 are formed, and the black matrix replacement electrode 316 and the pixel electrode 315 are spaced apart.

Another embodiment of the present invention provides a liquid crystal display panel. For details, please refer to FIG. 4, which will be described in detail below. The liquid crystal display panel includes:

The first substrate 410 is provided with a plurality of scan lines (not shown in the figure) for inputting driving signals, and a plurality of data lines 413 for inputting signals to the pixel electrode 418, the plurality of scan lines and the plurality of The data lines 413 are arranged crosswise and define a plurality of pixel units. Each of the plurality of pixel units includes a common electrode 411, a color resist layer, a pixel electrode 418, and a black matrix replacement electrode 419. The black matrix replacement The electrode 419 is arranged above the data line 413 to shield it and is insulated from the data line 413. The color resist layer includes a plurality of color resists located in the pixel area. Color resistance 415 and second color resistance 416,

Specifically, the first substrate 410 includes a common electrode 411, a first insulating layer 412, a data line 413, a second insulating layer 414, a first color resist 415, a second color resist 416, and a third insulating layer in order from bottom to top. Layer 417, pixel electrode 418 and black matrix replacement electrode 419;

The second substrate 420 is provided with a black matrix 421 formed on the corresponding area on the second substrate above the boundary between the first color resistor 415 and the second color resistor 416;

And, the liquid crystal layer 430 is disposed between the first substrate 410 and the second substrate 420, and the direction of the liquid crystal molecules in the liquid crystal layer 430 is controlled by whether or not power is applied, so as to refract the light of the backlight module to produce a picture.

Here, a hybrid structure of black matrix 421 + black matrix replacement electrode 419 is adopted, in which black matrix 421 plays a physical role in shading, and black matrix replacement electrode 419 plays a role of electrical control and shielding light leakage; therefore, the accuracy of the pairing can be improved, and the data line 413 is allowed in disguise. The width of the black matrix 421 is reduced. In addition, since the black matrix 421 covers the liquid crystal inefficient area near the black matrix replacement electrode 419, the contrast is further improved on the basis of the existing architecture.

In this embodiment, the vertical extension lines on both sides of the black matrix 421 are located on the inner side of the outer edge of the common electrode 411 on both sides of the data line 413 underneath. The width design can effectively cover the liquid crystal display. The effective area is used to improve the contrast, and avoid entering the pixel opening area when it is too wide to affect the aperture ratio.

Further, the distances between the vertical extension lines of the two sides of the black matrix 421 and the outer edges of the common electrodes 411 on the two sides of the data line 413 below the black matrix 421 are L1 and L2, and the L1 and L2 are both greater than 1 micron. , In order to prevent Overlay from causing a drop in aperture ratio and transmittance due to group shifting.

In this embodiment, the vertical extension lines of the two side edges of the black matrix 421 are respectively located outside the inner edges of the common electrodes 411 on both sides of the data line 413 below it to ensure sufficient shielding of the low-efficiency area of the liquid crystal.

In this embodiment, the black matrix replacement electrode 419 and the pixel electrode 418 are formed by the same film forming process and yellow photoetching patterning process, specifically, a physical vapor deposition process is used on the third insulating layer 417 A layer of indium tin oxide film is deposited, and then a corresponding pattern is formed through a yellow light etching process, that is, the black matrix replacement electrode 419 and the pixel electrode 418 are formed, and the black matrix replacement electrode 419 and the pixel electrode 418 are spaced apart.

In this embodiment, the vertical extension lines of the two side edges of the black matrix replacement electrode 419 are respectively located outside the inner edges of the common electrodes on both sides of the data line 413 below it.

In this embodiment, the vertical extension lines of the two sides of the black matrix replacement electrode 419 are respectively located within the two sides of the corresponding black matrix 421.

In addition, a comparative example of this embodiment is provided. The comparative example provides a liquid crystal display panel. Except for the black matrix 421 structure, the rest of the structure is exactly the same as the liquid crystal display panel provided in this embodiment.

Through testing, the absolute aperture ratio of the liquid crystal display panel provided by this embodiment is 5.2% smaller than that of the control example, but the liquid crystal efficiency is increased by 5.8% compared with the control example, which can ensure that the transmittance of the liquid crystal display panel provided by this embodiment is basically the same as that of the control example. It is equivalent, but the liquid crystal display panel provided in this embodiment reduces the dark field brightness due to the reduced area of the light-transmitting area, that is, it has a higher contrast ratio than the liquid crystal display panel provided in the comparative example.

It should be noted that only the above-mentioned structure is described in the above-mentioned liquid crystal display panel embodiment. It should be understood that, in addition to the above-mentioned structure, the liquid crystal display panel in the embodiment of the present invention may also include any other necessary structures as required, such as The gate, source and drain electrodes, interlayer dielectric layer (ILD), etc., are not specifically limited here.

For the liquid crystal display panel provided by the embodiment of the present invention, by applying a black matrix replacement electrode and a black matrix composite light-shielding structure at the data line routing, both the COA and Non-COA architectures can take into account effective aperture ratio and color mixing and light leakage control Features and significantly improves the contrast.

Based on the liquid crystal display panel provided in the foregoing embodiment, a liquid crystal display device is also provided, including the foregoing liquid crystal display panel.

In the above-mentioned embodiments, the description of each embodiment has its own focus. For a part that is not described in detail in an embodiment, please refer to the detailed description of other embodiments above, which will not be repeated here.

The liquid crystal display panel and the liquid crystal display device provided by the embodiments of the present invention are described in detail above. Specific examples are used in this article to explain the principles and implementations of the present invention. The description of the above embodiments is only used to help understanding. The method of the present invention and its core idea; at the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in the specific implementation and the scope of application. In summary, the content of this specification should not be understood To limit the present invention.

Claims

A liquid crystal display panel, characterized in that it comprises:

The first substrate is provided with a plurality of scan lines and a plurality of data lines crossing each other to define a plurality of pixel units, each of the plurality of pixel units includes a common electrode, a pixel electrode and a black matrix replacement electrode, so The black matrix replacement electrode is arranged above the data line to shield it, and is insulated from the data line;

The second substrate is arranged in a pair with the first substrate, wherein the black matrix is arranged on the second substrate and corresponds to the area between any two adjacent pixel units in the plurality of pixel units;

And, the liquid crystal layer is disposed between the first substrate and the second substrate.
3. The liquid crystal display panel of claim 1, further comprising a color resist layer disposed on the first substrate.
The liquid crystal display panel of claim 1, further comprising a color resist layer disposed on the second substrate.
2. The liquid crystal display panel of claim 1, wherein the vertical extension lines of the edges on both sides of the black matrix are respectively located inside the outer edges of the common electrodes on both sides of the data line below it.
4. The liquid crystal display panel according to claim 4, wherein the distance between the vertical extension lines of the two sides of the black matrix and the outer edges of the common electrodes on both sides of the data line below it is greater than 1 micron.
2. The liquid crystal display panel of claim 1, wherein the vertical extension lines of the edges on both sides of the black matrix are respectively located outside the inner edges of the common electrodes on both sides of the data line below it.
2. The liquid crystal display panel of claim 1, wherein the black matrix replacement electrode and the pixel electrode are formed by a same film forming process and a yellow light etching patterning process.
8. The liquid crystal display panel of claim 7, wherein the black matrix replacement electrode and the pixel electrode are spaced apart.
The liquid crystal display panel of claim 1, wherein the material of the black matrix replacement electrode is indium tin oxide.
3. The liquid crystal display panel of claim 2, wherein the color resist layer comprises a plurality of red color resists, a plurality of blue color resists, and a plurality of green color resists.
3. The liquid crystal display panel of claim 3, wherein the color resist layer comprises a plurality of red color resists, a plurality of blue color resists, and a plurality of green color resists.
3. The liquid crystal display panel of claim 2, wherein the color resist layer is disposed between the data line layer and the pixel electrode layer, and is insulated from the data line and the pixel electrode, respectively.
A liquid crystal display device, which comprises the liquid crystal display panel according to claim 1.